问题
单项选择题
在筛分煤粉时，当每分钟筛下的煤粒质量不超过（）时，筛分结束。
A.5g
B.10g
C.15g
D.20g
答案
参考答案：A
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在筛分煤粉时，当每分钟筛下的煤粒质量不超过（）时，筛分结束。
A.5g
B.10g
C.15g
D.20g
参考答案：A
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